Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 795 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
2. 2.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) propellers (c) tracks (d) wheels
4. 4.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
5. 5.⚙️ A motor makes 350 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
6. 6.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 90° (d) 180°
7. 7.True or false: to measure a turn angle, use a sound sensor. (a) True (b) False
8. 8.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) turns left (b) spins left on the spot (c) goes straight back (d) stays still
9. 9.🔍 Why do robots need sensors? (a) to be heavier (b) to look colourful (c) to use more power (d) to know their world
10. 10.True or false: to follow a black line, use a light sensor. (a) False (b) True
11. 11.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
13. 13.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the left sensor (c) far behind it (d) under the right sensor
14. 14.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
15. 15.Which job needs a gyro sensor? (a) feel a bump into a wall (b) stop before a wall (c) follow a black line (d) stay balanced upright
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
17. 17.🔍 Which sensor helps a robot hear a whistle? (a) a touch sensor (b) a light sensor (c) a camera (d) a sound sensor
18. 18.🔍 Which sensor helps a robot start on a hand clap? (a) a temperature sensor (b) a light sensor (c) a camera (d) a sound sensor
19. 19.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
20. 20.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
22. 22.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
23. 23.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
24. 24.⚙️ A 20-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
25. 25.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) idler gear (c) driven gear (d) tyre
26. 26.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
27. 27.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
28. 28.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
29. 29.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
30. 30.⚙️ A motor makes 100 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
31. 31.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
33. 33.🔍 Which sensor helps a robot follow a black line? (a) a sound sensor (b) a camera (c) a touch sensor (d) a light sensor
34. 34.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) a wheel (d) an output
35. 35.🧭 A robot spins 60° every second. How many seconds does it take to turn 360°?
36. 36.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) backwards (c) faster (d) slower
37. 37.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 15. What is under the sensor? (a) the white floor (b) the black line
38. 38.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 270°. It turns left 30°, then right 60°. What does the gyro read now (0° to 359°)?

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